Machine Learning Programming Languages -- which is the best and why?

Based on the summary, it's evident that Python is a better choice over other languages mainly because it being generic enough that it not just good for statistical/machine-learning related tasks but other generic tasks and having better support for all DNN frameworks like Tensorflow, Caffe. But, R can be very handy for a quick prototype that doesn't need to use DNN frameworks. So, to summarize, R is the choice of language for a quick prototype but for long term python is the choice of language.